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It costs more than $400,000 a person to detain asylum seekers in overseas detention centres a year, compared to $239,000 in Australian detention centres, a graph in the Commission of Audit report shows.

Immigration Minister Scott Morrison trumpeted the end of the Inverbrackie facility in particular.

"Prime Minister Gillard imposed this facility on the Adelaide Hills community, without any consultation," he said in a statement.

"For over three years, we have promised that a coalition government would close this facility and we are now delivering on this promise."